look down your nose atlook down (your) nose at (someone/something)
to consider someone or something as not important or of value.
The regular staff looked down their noses at us freelancers.
look down (one's) nose at (someone or something)
To regard oneself as superior to others and thus act in a haughty or snobbish manner. The well-dressed businessman looked down his nose at the homeless man sitting on the corner.Once Jane was promoted to management, she looked down her nose at the people who used to be her colleagues.